Reword the verdict of '!' syntax to not sound like there already is clutter in the format specification

Author: jb2170

peps/pep-0786.rst

@@ -258,7 +258,7 @@ Syntax
 
   Verdict:
 
-  - Whilst graphically attractive, ``!`` would add too much more clutter to the format specification for a purpose that can be achieved by overloading the preexisting ``z`` flag.
+  - Whilst graphically attractive, ``!`` would clutter the format specification for a single purpose that can be achieved by overloading the preexisting ``z`` flag.
 
 
 Backwards Compatibility